• Bailey, I.W.
  
• Vestal, Mary R.
  

In view of such technical difficulties as these, it is not surprising to find many contradictory statements in the literature concerning the structural arrangement of cellulose in the walls of specific cells. It obviously is essential to develop a technique which will enable the investigator to trace the details of fibrillar orientation throughout each of the successively formed parts of the secondary wall. The method recorded in the following pages appears to be of considerable value in the study of lignified tissues.